Developed and integrated the Haku Dark Theme UI for the zed-industries/extensions repository, focusing on enhancing the Rust development experience with a visually accessible pastel dark mode. The implementation leveraged Rust-oriented UI design principles and front end development skills to deliver a theme that improves developer focus and productivity. To streamline updates and maintenance, the theme was distributed as a submodule, requiring updates to both .gitmodules and extensions.toml for modular extension management. This approach enabled faster update cycles and scalable theme management for future extensions, demonstrating proficiency in Git, TOML configuration, and modular repository architecture within a collaborative development environment.